List of Interstate Highways in Iowa

"Iowa Interstate" redirects here. For the railroad, see Iowa Interstate Railroad.

Interstate Highways in Iowa form a network of freeways that cross the U.S. state of Iowa as part of the Interstate Highway System.

Interstate Highways of the Iowa Primary Highway System
Highway markers for I-80, I-380, and I-35 Bus. Loop
Interstate Highways in Iowa highlighted in red
System information
Formed	August 14, 1957[1]
Highway names
Interstates	Interstate X (I-X)
Business Loops:	Interstate X Business (I-X Bus.)
System links
Iowa Primary Highway System Interstate US State Secondary Scenic

Primary Interstates

Number	Length (mi)[2]	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed
I-29	151.941	244.525	I-29 at Hamburg	I-29 at Sioux City	01958-10-011958	current
I-35	218.532	351.693	I-35 near Lamoni	I-35 near Albert Lea, Minn.	01958-09-211958	current
I-74	5.399	8.689	I-80 at Davenport	I-74 / US 6 at Bettendorf	01968-08-301968	current
I-80	306.392	493.090	I-80 at Council Bluffs	I-80 at LeClaire	01958-09-211958	current

• Primary Interstates
• 
  I-29 as viewed from the Sergeant Floyd Monument
• 
  I-35 approaching exit 182
• 
  The Interstate 74 Bridge carrying I-74 across the Mississippi River
• 
  I-80 in western Iowa near Walnut
• 
  Traffic congestion on I‑35 / I‑80 during the Iowa flood of 2008

Auxiliary Interstates

Number	Length (mi)[2]	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
I-80N	17.102	27.523	I-29 at Loveland	I-80 near Neola	01966-01-011966	01973-01-011973	Replaced by I-680; now I-880
I-129	0.286	0.460	I-129 / US 20 / US 75 at Sioux City	I-29 / US 20 / US 75 at Sioux City	01976-11-221976	current
I-235	14.585	23.472	I-35 / I-80 at West Des Moines	I-35 / I-80 at Des Moines	01961-12-141961	current
I-280	9.862	15.871	I-80 / US 6 at Davenport	I-280 at Rock Island, Ill.	01973-10-251973	current
I-380	72.969	117.432	I-80 / U.S. Route 218 / Iowa 27 near Coralville	US 218 at Waterloo	01973-09-191973	current
I-480	0.877	1.411	I-480 / US 6 at Council Bluffs	I-29 / US 6 at Council Bluffs	01966-09-211966	current
I-680	3.353	5.396	I-680 at Omaha, Neb.	I-29 near Crescent	01966-12-131966	current
I-880	17.102	27.523	I-29 at Loveland	I-80 near Neola	02019-10-052019	current	Replaced a portion of I-680
Former

• Auxiliary Interstates
• 
  I‑235 crossing the Des Moines River in Des Moines, Iowa
• 
  The Edna M. Griffin Memorial Bridge carrying I‑235 across the Des Moines River
• 
  The I‑480 bridge over the Missouri River between Council Bluffs, Iowa and Downtown Omaha, Nebraska
• 
  I‑280 crosses the Mississippi River over the Baker Bridge.

Business routes

Number	Length (mi)[2]	Length (km)	Southern or western terminus	Northern or eastern terminus	Cities	Formed	Removed
I-35 Business Loop	6.927	11.148	I-35 / US 30 in Ames	I-35 in Ames	Ames	01995-10-271995	current
I-35 Business Loop	2.979	4.794	I-35 / US 18 in Clear Lake	I-35 / US 18 / Iowa 122 in Clear Lake	Clear Lake	01999-04-171999	current